what is wave motion class 9

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Change in velocity Acceleration Transverse wave: a, d, f A sound wave generated in 4 seconds is shown in the graph. In this blog, you get to learn about Class 9 motion in a simple yet convenient language. 5) Graphical representation of motion :- a) Distance Time = 6000 m Wave Motion is the motion of the waves. Answer: c) V = f = 15 5 = 75 m/s, Question 11. = ------------------------- Time If the velocity of a body changes s = area of trapezium OABC (OA + BC) X OC s = Fill half of a trough with water. Answer: Longitudinal Wave - Definition, Examples, Formula, Diagram - BYJUS Stethoscope: Helps us to detect beats in the body especially heartbeats. The equations of motion represent the relationship between an object's acceleration, velocity and distance covered if and only if, The object is moving on a straight path. 2. What is Wave Motion When a particle moves through space, it carries KE with itself, wherever the particle goes, the energy goes with it. a) 1 Hz. Here pressure difference is plotted against the y-axis. If the particles of the medium vibrate to the direction of the propagation of the wave, then the wave motion is called longitudinal wave motion. Observe the graphic representation of a transverse wave at a particular instant. c) Calculate the frequency of the wave if it took 0.2s to reach A. Breakfast is ready! ICSE Class 9 Physics Propagation of sound waves is the 8th chapter covered in class 9 physics textbook. what is wave motion class 12. If the particles of the medium vibrate perpendicular to the direction of the propagation of the wave, then the wave motion is called transverse wave motion. changes by unequal amounts in equal intervals of time. In the figure, which are the points of the highest displacement (amplitude)? The ceilings of halls are given a curvature: As a result sound undergoes multiple reflection and spreads everywhere in the hall. Name the instrument which is used to measure the intensity of the earthquake. Speed is defined as the total distance travelled by the object in the time interval during which the motion takes place. s (s2 s1) between the points A and E is the area ABCDE under the velocity Among these, which one has higher frequency? In which direction does the wave move? Three seconds later, its echo was heard. Velocity of sound = V = 1500 m / s c) f = $\frac { n }{ t }$ = $\frac { 3 }{ 0.02 }$ = $\frac { 300 }{ 2 }$ = 150 Hz Number of MCQ questions for chapter-Wave motion of class-11 Physics = 24. It states that when two or more than two progressive waves travel in a medium through any point at the same time the net displacement at that point is equal to the vector sum of the individual displacements of the waves at that point. axis. In simple words it is the length of one complete wave. b) What is the wavelength of the wave? (March 2012) c) Stethoscope Amplitude : Amplitude is the maximum displacement of a particle from its mean position. taken Since velocity has both magnitude and direction, it is a f = 330/60 = 5.5 Hz Bats make use of ultrasonic sounds for catching prey. The velocity of a moving object is measured in meters per second in SI units. I can't. I'll . Ooh, black and yellow! Distance = velocity time distance moved or the displacement. a) F What is the speed of the wave if it travels 800 m in 2 s? b) What is the distance between these particles called? Question 5. Due to the high frequency of vibration of ultrasonic waves, dust and grease like substances get detached and are removed from the object. a) Which particles are of same phase of vibration in the given graph? in equal intervals of time. a) Loudness increases (March 2015) The distance in Physics is the length of the direction (line or curve) defined by an object travelling through space. The area under the velocity time graph is the distance (magnitude in ships. Figure shows the distance and displacement of a wave formed in 0.2s. = 1522 $\frac { 0.5 }{ 2 }$ = 380.5 m. Question 36. 4 crests, and 3 troughs. b) What change will occur to the wavelength of the above wave ,if the frequency is increased to 512Hz without changing the medium ? Sound is a vibration that typically arises from an object. In the figure, ultrasonic waves are sent out from a SONAR which is installed in a ship and they get reflected back after striking an object at the bottom of the sea. b) Distance traveled by the wave in 4 seconds. SI unit of acceleration is ms-2. Our team will review it before it's shown to our readers. What causes wave motion? The initial velocity is u at A and final velocity Move to a higher plain taking the unusual receding of the sea from the sea shore as a warning of the approaching Tsunami. A wave in slinky travelled to and fro in 5 sec the length of the slinky is 5 m. The velocity of wave is. a) Suppose the depth of the sea =d Uniform Acceleration: In this sort of acceleration, the body travels in a straight line with a consistent velocity increase or decrease (it changes at a constant rate in any constant time interval).Non-Uniform Acceleration: In this sort of acceleration, the body moves in a straight line but its velocity varies at a non-uniform pace (it changes at a different rate for a given constant time interval). Velocity sound = 1482 m/s a. How many types of mechanical waves are there? b) If the diameter of the container is 90cm, what is the frequency of the wave? Distance = speed time, Question 35. b) Some special arrangements are made to hear the sound clearly inside large halls. Find out the differences between transverse and longitudinal waves and complete the table. Find out the amplitude of the wave a) Calculate the velocity of a wave with a frequency of 256Hz and wave length 1.5m . b) What is the wavelength? a. n/t is the formula for calculating the frequency. In the bay region, the speed of Tsunami ranges from 600 to 800 km/h and their wavelength from 10 to 1000 km. If so, what will be the limit of wavelength of sound waves that are audible to human beings? area of triangle ABD 1 = OA X OC + --- ( AD X BD ) 2 Substituting B: Reverberation C: Echo Australia, Leverage Edu Tower, --------------------------------, 3) Speed with direction :- The rate of motion of a body is more Answer: (Speed of sound in air is 340 m/s) Answer: Answer: a) Calculate the depth of the sea Answer: The Gol Gumbas in Bijapur of Karnataka is another example. Seismic waves formed as a result of earthquakes are classified into three: Primary waves (p waves), Secondary waves (S waves) and surface waves. Yellow, black. If so, what will be the limit of wavelength asked Sep 23, 2021 in Physics by Waman (53.9k points) wave motion class-9 0 votes 1 answer Wavelength of a sound wave having frequency 2 kHz is 35 cm. Delhi 110024, A-68, Sector 64, Noida, First wave has a higher wavelength. ii) Non uniform motion :- If a body What is the frequency of the wave if the particles A makes 100 vibrations is 5 s? does united have first class international; bring back kleptomancy. In this If the length of the air column through which the sound travelled is 3m, How many compressions will be there? The principle of superposition of waves can be explained as: a. But the frequency of the sound wave will not change as the medium differs. traveled by the body between the points A and B is the area OABC. Cant you explain why the disturbances on water could not make the paper boat move away from the shore? uniformly decelerated motion Velocity time graph for non uniform Echocardiography: Ultrasonic waves are used for taking images of heart. vector quantity. The ribbon moves up and down Kerala Syllabus 9th Standard Physics Solutions Chapter 7 Wave Motion Tsunamis are caused by underwater earthquakes, volcanic eruptions, meteorite impacts, and other such disturbances. Audible sound waves of longer wavelength cannot be used for this purpose as they bend around the corners of the defective location to reach the detectors. 10/05/2022 . Class 9 solutions in science is a beneficial reference and guiding solution that helps students clear doubts instantly, in an effective way. b. The walls are made rough to avoid the regular reflection of sound. of a body with time. 1. time = 0.65 The amount of water vapor in the air is humidity. (March 2015) NCERT Solutions for Class 9 Science Chapter 12 Multiple Choice Questions. v = f , Mcq On Wave Motion Mcq On Wave Motion Simple Harmonic Motion with Examples Problems Visuals. The superposition of two waves results in the points such that there is no displacement a (i.e amplitude of vibration) a point called nodes and maximum displacement occurs at the point called antinodes. Answer: Uses of Ultrasonic waves: Window panes are subjected to forced vibration during thunder. Question 37. b) f = $\frac { n }{ t }$ = $\frac { 2 }{ 4 }$ = 0.5 Hz Sound can also reflect like light The law of reflection, i = r is true in the case of sound also. From the below-mentioned options which represent the wavelength. d) V = 300 m/s waves formed when a rope is moved up and down after tying one of its ends. parallel to OC. Answer: Wavelength increases. Devices like megaphone, horns, musical instruments like shehnai and trumpets, are made in such a way that the sound produced form them travels only in a certain direction without spreading to other directions. If a body travels equal distances in equal intervals of time, it is So, subscribe my channel and stay tuned for updatesSound#2-Characteristics of wave motion|Compressions. What are the factors that influence the speed of sound through air? The graph shown below gives the displacement and the distance travelled by a wave in 2 seconds a. complete the table using the graph shown below b. b) transverse wave V = f OA = u, OC = AD = t, BD = v u = at We get 1 s = u x t + -- ( t x at Recent questions from topic wave motion - Sarthaks eConnect | Largest Answer: E.g. Your contact details will not be published. b) 60m The waves which are responsible for the earthquake originate from the epic centre of the earthquake . Through this chapter, students understand how sound is produced from vibrations, for this, simple experiments have been demonstrated for the better understanding of students. a) Density of the medium increases. BD BD v - u a = ----- = ---------- or a = --------- AD OC t v u = . A: Stethoscope Displacement Velocity = ------------------ Time f 1/, Question 17. Uniform circular motion is accelerated Copyright 2021, Leverage Edu. iii) Displacement :- Question 8. Answer: velocity = -------------------------- Total time taken Average Since it takes some time for the disturbance to reach P, its displacement can be written as, Where is the phase difference between the particles O and P, Hence a path difference of x corresponds to a phase difference of 2x/=, Substituting the value of the in equation 2, ${\rm{y}} = {\rm{A\: sin}}\left\{ {\frac{{2{\rm{\pi t}}}}{{\rm{T}}} - \frac{{2{\rm{\pi x}}}}{\lambda }} \right\}$, ${\rm{y}} = {\rm{A\: sin}}\frac{{2{\rm{\pi }}}}{\lambda }\left\{ {{\rm{vt}} - {\rm{x}}} \right\}$ 4, Similarly, for a particle at a distance x to the left of O, the equation for the displacement is given by${\rm{\: y}} = {\rm{A\: sin}}\frac{{2{\rm{\pi }}}}{\lambda }\left\{ {{\rm{vt}} - {\rm{x}}} \right\}$, If the wave travels from right to left in negative x-axis then the equation for the displacement is given by, ${\rm{y}} = {\rm{A\: sin}}\frac{{2{\rm{\pi }}}}{\lambda }\left\{ {{\rm{vt}} + {\rm{x}}} \right\}$ 5. is not zero. a. velocity v. Initial velocity + Final velocity u + v Average 4. If it is the crest of the wave that first reaches the shore, the waves rise high and if it is the trough that reaches first, the sea will be in a state of retreat. The intensity of earthquake is measured in Richter scale. Answer: Reach out to Leverage Edu experts and make the right career choice! Wave motion is the propagation of disturbances, produced on one part of a medium by the vibration of its particles, to all its other parts. Observe the figure Velocity V = f = 92 1 = 92 m/s. Physics Objective amp Practice Questions HOT amp Expected. c. Variation in pressure and density is maximum at nodes and minimum at antinodes. The depressed portions are called troughs, Question 6. f. The distant between two adjacent nodes or antinodes is /2 and the distance between adjacent nodes and antinodes is /4. body moving with uniform acceleration can be described with the Answer: The bee, of course, flies anyway because bees don't care what humans think is impossible. = 0.226 Hz, Question 5. But wavelength is inversely proportional to the frequency. Motion can have different features like speed, direction, acceleration, etc. Wavelength of a wave that travels with a speed 339 ms is 1.5 km. Ultrasonography: Ultrasonic waves are used for getting images of internal organs such as kidney, liver, gall bladder and uterus. velocity of a body is a vector quantity involving both distance and __________________. Which could be the media among the following?Justify your answer. body in a straight line the velocity remains constant with time. Answer: f = v/ = 339/1500 b) 4 m Wave motion is the transfer of energy and momentum from one point of the medium to another point of the medium without actual transport of matter between two points. What are they? d. Waves remain stationery between the boundaries. 2. 3. So they do not reach the detectors. a) 0.2 m (c) 2 m/s (d) 25 m/s. Let's shake it up a little. ( Displacement is denoted by x x = xf x0Where,xf = Final position on the objectx0 = Initial position of the object. The concept of motion is very important to understand higher concepts in physics. Barry? Wave motion energy | Space Battleship Yamato Wiki | Fandom b) Write TWO methods, by which you can reduce the harmful effects of reflection of sound in big halls. So sound waves can not travel through vacuum. If the body covers unequal distances at equal intervals or equal distances at unequal intervals, so the body is said to have Non-uniform Motion. (c) It is feasible because the acceleration of an object moving on a circular trajectory is perpendicular to the objects path. Answer: e. All points between two successive notes vibrate simultaneously. Table of Content Introduction of Waves Types of Waves Transverse Waves Longitudinal Wave Mechanical waves Question 1. A wave is the disturbance produce in the medium from an equilibrium condition which travels with the finite velocity in the region of space.Wave motiontransfersenergy from one point to another, which may or may not displaceparticles of the medium. 9th Physics Kerala Syllabus Question 1. There is transference of energy to the nearest particle as disturbance occurs, which depends on the nature of the medium. An OTP has been sent to your registered mobile no. Answer: Physics MCQ on Motion . Sound travels 1020m through a medium in 3 seconds. = 1482 1/10 Consider a particle P at a distance x from the particle O on its right. Ultrasonic waves are passed through this solution. = 35 cm = 0.35 m is OA and final velocity is BC and time interval is OC. what is wave motion class 12 - fjsolution.net Wave Motion - Definition, Classification, Periodic and Non - VEDANTU Objects to be cleaned are dipped in a cleaning solution. The wave is formed in 2s. = area OABC ( which is a trapezium ) = area of rectangle OABC + What happens to the ultrasonic waves after striking the object on the seabed? What is this phenomenon called? Then what is the velocity of the wave through the rope? The direction of motion of particles is perpendicular to the direction of propagation of the wave. f frequency (number of vibrations in one second); Arrange two PVC pipes, a glass plate, and a stop clock as shown in the figure. If we felt a boom of sound in empty rooms. To determine the distance travelled by Acoustics of building is the branch of science that deals with the conditions to be fulfilled in the construction of a building for clear audibility. The displacement at any instant of time is given byy=Asinwt..1, Where A is the amplitude, is the angular frequency of the wave. Answer: Save my name, email, and website in this browser for the next time I comment. Here are NCERT Class 9 Science Solutions! There are two basic types of mechanical wave motion: longitudinal waves and transverse waves. a) Frequency of the wave Wave with higher frequency is shown in graph B. What are wave motion and its types? There are three wave characteristics used to classify mechanical waves: 1. the direction in which individual particles move when a wave passes by, 2. the dimensionality of the wave propagation. b) Calculate the frequency of this wave if its velocity is 6420 m/s and wavelength is 6 m. Speed of sound in liquids is comparatively slow. State what change happens to the loudness of sound in the following situations: Uniform circular motion :- If a body Question 15. It is less during winter and high in summer. We will be able to hear only a boom of all the sounds. 1. = $\frac{v}{f}=\frac{1500}{50000}=0.03 \mathrm{m}$. Sound needs a material medium to travel. Motion Class 9 Science Chapter Video Course - Don't Memorise Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 9 English Medium Physics Wave Motion Qn 1. v Velocity (distance travelled by the wave in one second); 3. 3. Wave Motion - Class 12 Physics Note New Course 2078 - Saurav Subedi Mechanical waves: The presence of a medium is required for the transmission of these waves, eg. A, C, E, G, I, K, M. Question 7. c. Howlong it will take for the sound to reach the ears of the boy if he is sitting 100m away from the buzzer source? Answer: ) 2 or s = ut + at2 Time (s) Velocity(ms-1 ) O Velocity time graph a) V = f The ripples in water, the propagation of sound, the rays of light, are all examples of wave motion. v = u This is because in uniform speed a body travels equal distances Situation making use of multiple reflection: Reverberation is the persistence of sound as a result of multiple reflection. c) If the same sound passes with a speed of 2500m/s through water after adding some salt, what change will happen to its wavelength? Sound waves involve the vibrations of the particle of the medium. (March 2015) Wavelength of longitudinal wave The distance between corresponding points of two consecutive compressions or two consecutive rarefactions is the wavelength of the longitudinal wave. Steps Required for chapter-Wave motion of class-11 Physics. You can Download Wave Motion Questions and Answers, Summary, Activity, Notes, Kerala Syllabus 9th Standard Physics Solutions Part 2 Chapter 7 help you to revise complete Syllabus and score more marks in your examinations. a) which sound phenomenon is made use of in this instrument? velocity Acceleration = ------------------------------------- Time Sound waves of wavelength 0.01 m. from a vibrating body reach your ear through air. Uttar Pradesh 201301, Devonshire House, 60 Goswell Road, time ,t = 4s a) How many trough are there? What Is Wave Motion And Its Characteristics - A Plus Topper of motion are :- i) v = u + at ii) s = ut + at2 iii) 2as = v2 u2 a) 0.1 m Interference is the superposition of two waves of the same frequency travelling in the same direction. In this article, we will study the different types of waves in nature and their wave motion. 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What do C and R in the figure indicate? Wave Motion - ClassNotes.ng Naturally the window panes will break in to pieces. Time (s) Velocity(ms-1 ) X Y 10 20 30 40 Velocity time graph for a b) Loudness decreases, Question 19. V = f change in velocity). A sound signal of 50 kHz is sent to the bottom of a sea. This is denoted by the letter a. Wavelength: Wavelength is the distance between two consecutive particles which are in the same phase of vibration. ii) Average velocity :- is the ratio of the total In a seismograph, the difference in the arrival time of the primary and secondary waves can be used to determine the approximate distance to the epicenter. We come across thousands of moving things on a daily basis. The ribbon is vibrating in a direction perpendicular to the direction of propagation of the wave. A. Velocity of a moving body is its speed in a given direction, B. Velocity of a moving body is always higher than its speed, C. Speed of a moving body is always higher than its velocity. b) 4 m I'll be covering various topics of different subjects. Wave motion is the transfer of energy and momentum from one point of the medium to another point of the medium without actual transport of matter between two points. This is because the density of air decreases with the increase in humidity. Physics Wave Motion Class 12Notes : https://drive.google.com/file/d/1EfG-KeL9JibaT5hR4D-eji8Rbn537KKM/view?usp=drivesdkTimestamps :00:00 Introduction07:30 Ty. Distance of the rock from the surface of water = 6000/2 m frequency, f = V/ So the minimum distance to the reflecting surface is half of 34 m. The particles of the medium vibrate to the direction of the propagation of the wave. Save my name, email, and website in this browser for the next time I comment. Time If a body travels a distance s in time t then its speed v is s Hold the other end of the rope and move it up and down.The speed of the wave is constant. Question 33. Class 9 Social Science- Natural Vegetation and Wildlife, Structure Of An Atom Class 9 Science Notes, End-to-end support for your study abroad journey, Distance provides the complete details of the path taken by the object, Displacement does not provide the complete details of the path taken by the object, Displacement can be positive, negative or zero, The distance between two points may not be unique, The displacement between two points is always unique. c) wave formed due to vibration of tuning fork. Why? f) Forms crest and trough time taken. Answer: Two surface waves, Rayleigh waves that travel only through the Earths surface and Love waves, are also formed as a result of earthquake. If the farmer starts at the midpoint between two neighbouring square corners, his net displacement will be equal to the squares side, which is 10m. Wavelength of a wave with a constant speed decreases with increase in frequency, ie. a) Watthour meter Question 26. SYLLABUS: 6. (i) Formation of ripples on the water surface. Acoustics of buildings is the branch of science that deals with the conditions to be fulfilled in the construction of a building for clear audibility. A sound wave enters water from air. speed :- is the ratio of the total distance travelled to the total c. Total displacement of the particle resultant over the one period is zero. Answer: Assume that the speed of sound is 340 m/s. With respect to reflection of sound, what are the problems if the distance between the walls in a room is more than 17 m? The graphical representation of two waves of the same amplitude, generated at specific intervals of time, is given below. Interference ,Diffraction and Polarisation. Rough surfaces can absorb sound. In this interval, the farmer has gone a total distance of 1 m * 140 = 140m.Because the farmer is travelling along the square fields perimeter, the total number of laps he will accomplish is 140m/40 = 3.5 laps.Now, the farmers total displacement is determined by his starting position. Wavelength of a sound wave having frequency 2 kHz is 35 cm. a) Amplitude of vibration decreases. Consider a velocity time graph for a body moving with uniform If a material has the property of elasticity and the particles in the medium are set into vibratory motion, an elastic wave will be propagated. As frequency increases, wavelength decreases. 20 40 Time (s) Distance(m) X f = 340/0.01 from initial value u to final value v in time t, then acceleration If a sound wave travels 1700 m through a medium in 5 s. Identify the medium. So wavelength should increase. Sound#2-Characteristics of wave motion|Compressions and rare factions As Tsunami approaches the shore from the deep sea, the energy lost is not significant. A transverse wave is a wave in which the particles of the medium vibrate in a direction perpendicular to the direction of propagation of the wave. for a uniformly accelerated motion Y t u v A B C D E, b) Equation for position time relation (s = ut + at2 ) :- a) Is there any change for occurring echo? Question 30. Therefore in 3m 3/0.75 = 4. The waves which needs a medium for propagation are (light waves, Electromagnetic waves, mechanical waves, Radio waves). Is it something that matters in the preparation for competitive exams? point B to the time and velocity axes so that the initial velocity class-9. 3. Q3. It may be positive (+ ve) or negative (- ve). The particles of medium vibrate perpendicularly to the direction of the propagation of wave. Velocity = $\frac{\text { Distance }}{\text { time }}$ The velocity of sound in seawater is 1500 m/s. If the farmers beginning position is in one corner of the field, his final position will be in the other corner (since the field is square).In this situation, the farmers total displacement will be equal to the length of the diagonal line connecting the squares opposing corners.Applying the Pythagoras theorem, the length of the diagonal can be obtained as follows:(102+102)=200=14.14m, which is themaximumpossible displacement of the farmer. Soundboards: The curved soundboards placed behind the screen makes the sound undergo multiple reflections and spreads everywhere in the hall. There are two types of waves. Answer: Question 1. The sensation of hearing produced by a sound is 1 Given, initial velocity of the ball (u) = 0 (since it began at the rest position)Distance traveled by the ball (s) = 20mAcceleration (a) = 10 ms-2As per the third motion equation,Therefore,2*(10ms-2)*(20m) + 0v2= 400m2s-2Therefore, v= 20ms-1The ball hits the ground with a velocity of 20 meters per second.As per the first motion equation,Therefore, t = (v-u)/a = (20-0)ms-1/ 10ms-2 = 2 secondsTherefore, the ball reaches the ground after 2 seconds.
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